Malicious PDF — malware analysis report

Static analysis result for SHA-256 27165b897754f141…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 20:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f00a70cbfe74cb1297c99da067bf6ef SHA-1: afaf7dfed674dcb4713fe774cdbb498194dcdc80 SHA-256: 27165b897754f141c6695ab7bd0cd909fe86d9a76428186738b652d36a535c6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised or disposable hosting, indicative of a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or malware distribution tactic. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=free+fire+max+how+to+download
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/fogotapimevigatibis.pdf
    • http://sbcnepal.com/images/file/99791922758.pdf
    • http://lienming-rubber.com/uploads/files/202109181436496747.pdf
    • https://legyenegyjonapod.hu/userfiles/files/75417738528.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614593e9595f9---petizafofitozavimud.pdf
    • http://voszveszprem.hu/_user/file/39654280601.pdf
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/pekuzof.pdf
    • https://thietkeweblongan.com/upload/files/74915049096.pdf
    • http://acevina.com/webroot/img/files/wigedezebita.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/27926985261.pdf
    • https://cuichi177.com/uploads/files/202109161047561223.pdf
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/mimizuwipa.pdf
    • http://struttur-arch.it/userfiles/files/71138916800.pdf
    • http://everestlodgelukla.com/userfiles/file/58466636858.pdf
    • https://dm288.rs/slicice/file/losafopexofibuxejepikanu.pdf
    • http://cn-daomeng.com/upload/userfiles/files/ab8ab7366e2ac3249aec667a9976072e.pdf
    • https://ferest.ro/imagini_ws/14186764073.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454e872a00e---90434957730.pdf
    • https://marblobath.com/app/webroot/img/files/sofukawokubi.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132db56cbc8f---gukiwo.pdf
    • http://steakclubhn.com/campannas/file/30740351537.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/75233753059.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e51544d853---xonijizima.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d490.bin
644883c8a01e7370127d1985b65be1e20d0923bbfd1d6120feccb12f666cf445
pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 10616 bytes
font_01_sfnt_off0000eca4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 16792 bytes
font_02_sfnt_off000104b6.bin
338826a93421c41d90a2353ff34331e56984805b6185d04debda17149483245d
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 17536 bytes